Internal combustion engine accessory units assemblies

ABSTRACT

ACCESSORY UNITS FOR AN INTERNAL COMBUSTION ENGINE ARE MOUNTED ON A HOUSING ADAPTED TO BE DETACHABLY SECURED TO THE ENGINE, THE HOUSING CARRYING A SINGLE DRIVE SHAFT FOR THE IGNITION DISTRIBUTOR, AN OIL PUMP AND A FUEL PUMP, AND THE DISTRIBUTOR AND OIL PUMP AND A FUEL PUMP ACTUATOR CAM BEING ARRANGED COAXIALLY OF THE DRIVE SHAFT WHICH IS ADAPTED TO BE DRIVEN BY A DRIVE CHAIN BELT WHICH DRIVES THE ENGINE CAM SHAFT.

Sept; 21, 1971 1- F. GREGORY 3,606,814

INTERNAL COMBUSTION ENGINE ACCESSORY UNITS ASSEMBLIES Filed April 30,1970 3 Sheets-Sheet 1 [nuenior flona/djrea'erzk'i fire azy A Home ySept. 21, 1911 D.F.G EGORY 3,606,874

INTERNAL COMBUSTION ENGINE ACCESSORY UNITS ASSEMBLIES Filed April 30.1970 v :5 Sheets-Sheet Eona/a Judaic Grqmy' W Kw zorn ey Sept. 21,. 1971D. F. GREGORY INTERNAL COMBUSTION ENGINE ACCESSORY UNITS ASSEMBLIESFiled April 30, 1970 3 Sheets-Sheet 5 Inventor flow/a Juderkl Gnyory WUnited States Patent Wee" 3,606,874 INTERNAL COMBUSTION ENGINE ACCESSORYUNITS ASSEMBLIES Donald Frederick Gregory, Leighton Buzzard, England,assignor to General Motors Corporation Filed Apr. 30, 1970, Ser. No.33,311

Claims priority, application Great Britain, May 10, 1969,

23,899/69 Int. Cl. F02b 77/14 US. Cl. 123195A 3 Claims ABSTRACT OF THEDISCLOSURE Accessory units for an internal combustion engine are mountedon a housing adapted to be detachably secured to the engine, the housingcarrying a single drive shaft for the ignition distributor, an oil pumpand a fuel pump, and the distributor and oil pump and a fuel pumpactuator cam being arranged coaxially of the drive shaft which isadapted to be driven by a drive chain belt which drives the engine camshaft.

This invention relates to internal combustion engine accessory unitssuch as fuel pumps, ignition distributors and oil pumps, and theirattachment to, and drive by, an internal combustion engine.

According to this invention an engine accessory units assembly comprisesa housing adapted to be detachably secured to a seat on the engine, anaccessory units drive shaft which has fixed thereon a toothed pulleyadapted to be driven by an engine drive chain belt, or a toothed belt,and a plurality of engine accessory units including a fuel pump, :anignition distributor and an oil pump, mounted on said housing, saidignition distributor and oil pump and a fuel pump actuator cam beingarranged coaxially of said drive shaft for drive thereby. The accessoryunits drive shaft is preferably a horizontal shaft mounted parallel tothe engine cam shaft, the drive belt driving both the cam shaft and thetoothed pulley on said drive shaft.

The ignition distributor is mounted horizontally instead of in thecustomary vertical position; and the housing preferably also carries amount face for an oil filter, conveniently in the form of a discardablesheet metal casing containing an oil filter element, the housing beingprovided with passageswhich communicate with the inlet and outlet portsof the filter element and with inlet and outlet ports of the enginelubrication system. The housing preferably also includes an oil pressurevalve and an oil filter by-pass valve.

The scope of the invention is defined by the appended claims; and theinvention and the method by which it is to be performed are hereinafterparticularly described with reference to the accompanying drawings inwhich:

FIG. 1 is a vertical section through an accessory units assemblyaccording to the invention, as seen on the line I-I of FIG. 2.

FIG. 2 is an end elevation of FIG. 1, as viewed on the line IIIIthereof; and

FIG. 3 is a view on the line IIIIII of FIG. 2, the fuel pump, oil filterand toothed pulley being omitted therefrom for the sake of simplicity.

The engine accessory units assembly shown in the drawings comprises ahousing 1 formed with a seat face 2 with apertures 3 therein by whichthe housing 1 is adapted to be bolted on to a seat on an internalcombustion engine. The housing 1 has journalled therein in bearings 4 ahorizontal drive shaft 5 on one end of which is secured a toothed pulley6 around which extends a toothed drive belt 7 which also extends arounda toothed pulley (not shown) secured on the engine camshaft (not3,606,874 Patented Sept. 21, 1971 shown). Mounted on the end of thehousing opposite the toothed pulley 6 is a horizontally mounted ignitiondistributor 8 having a drive shaft 9 which is coaxial with the shaft 5and has at its end a tongue 10 which engages in known manner in aslotted end portion 11 of the drive shaft 5 to provide a drive connectedtherewith.

The customary centrifugal advance and retard mechanism of thedistributor 8, indicated at 8a, is conveniently housed as shown, in arecessed end portion 13 of the housing 1. Also mounted on the driveshaft 5 adjacent the end portion 11 thereof is the internal rotor of anoil pump of the internally meshing lobed gear type the outer rotor 14 ofwhich is journalled in a recessed portion 15 of the housing 1 whichconstitutes the pump chamber, the latter being closed by a cover plate16 secured thereover. The cover plate 16 and the recessed portion 15 ofthe oil pump are formed with similar arcuate recesses 17, 18respectively which act to equalize the pressure on opposite sides of therotors. The pump chamber 15 has inlet and outlet ports (not shown) whichcommunicate with an inlet passage 19 and an outlet passage 20 whichopens at the mount face 2 and are adapted to be placed in communicationwith corresponding passages of the engine oil lubrication system whenthe mount face 2 is secured to the seat on the engine.

Instead of the oil pump described a gear pump could be used, one of thetwo meshing pump gears being mounted coaxially on the shaft 5.

The housing 1 is also formed with an internal cavity 21 to accommodate arotary drive cam 22 for a fuel pump 23 which is bolted on to a mountface 24 therefor on the housing 1. The fuel pump 23 is operable by arocker arm 25 the inner end of which extends through an opening 26 inthe mount face 24 and engages the cam 22. The cam 22 is secured on theshaft 5 by a drive pin 27.

The housing 1 is also formed with a seat face 30 for an oil filter 31which is preferably of the kind in which a filter element is enclosed ina discardable sheet metal canister having a central threaded socket. Thefilter 31 is secured to the seat face 30 by screwing the threaded socketon to a threaded spigot 32 which is secured coaxially of the mount face30, the spigot being in communication with a passage 33 in the housing 1for the delivery of filtered oil to the engine lubrication system. Thedelivery passage 20 from the oil pump 12, 14 is in communication with apassage 34 which opens into an annular recess 35 in the mount face 30 bywhich oil to be filtered is delivered to the filter 31.

The oil inlet and outlet passages in the housing 1 may incorporate, inknown manner, an oil pressure valve and a by-pass valve so that, whenthe pump pressure exceeds a predetermined maximum value an outlet to theengine oil sump is opened, and when the filter pressure exceeds apredetermined value, the filter element is by-passed.

The attachment of the assembly described to the seat on the engine isnot described or illustrated herein, as it will be well understood bythose skilled in the art, or for example, by reference to U.S. Pat.3,338,229, De Lorean et al., wherein the attachment of an accessoryunits assembly to a seat on an engine is described and shown, as well asthe manner in which the tension of a drive belt or chain on the enginecamshaft.

The assembly described provides a compact arrangement of the engineaccessory units which can be readily incorporated in the assembly beforethe latter is attached to the engine, thereby reducing manufacturingcosts and lessening the possibility of improper assembly.

I claim:

1. An internal combustion engine accessory units as sembly comprising ahousing formed with a mount face by which it is adapted to be detachablysecured to a seat on an engine; an accessory units drive shaftjournalled in said housing, said drive shaft having 'one end thereofextending from said housing; a toothed pulley secured on said one end ofsaid drive shaft; an ignition distributor mounted on said housing andincluding a distributor drive shaft mounted coaxially with saidaccessory units drive shaft and in driving engagement 'with the otherend thereof, a fuel pump mounted on said housing and adapted to beactuated by a rocker arm one end of which engages a rotory cam securedon said shaft; and an oil pump mounted within said housing and includingan input member mounted coaxially on said accessory units drive shaftand an output member driven by said input member, said housing includingpassages by which an inlet and outlet of the pump are in communicationwith oil inlet and outlet ports which open at said mount face.

2. An internal combustion engine accessory units assembly comprising ahousing formed with a mount face by which it is adapted to be detachablysecured to a seat on an engine; an accessory units drive shaftjournalled in said housing, said drive shaft having one end thereofextending from said housing; a toothed pulley secured on said one end ofsaid drive shaft; an ignition distributor mounted on said housing andincluding a distributor drive shaft mounted coaxially with saidaccessory units drive shaft and in driving engagement with the other endthereof, a fuel pump mounted on said housing and adapted to be actuatedby a rocker arm one end of which engages a rotary cam secured on saidshaft; an oil pump mounted within said housing and including an inputmember mounted coaxially on said accessory units drive shaft and anoutput member driven by said input member, said housing includingpassages by which an inlet and outlet of the pump are in communicationwith oil inlet and outlet ports which open at said mount face; saidhousing having therein a further mount face to which is secured an oilfilter, said further mount face having therein passages which openthereat and by 'which said filter is connected in circuit with said oilpump and said oil inlet and outlet ports.

3. An internal combustion engine accessory units assembly according toclaim 2, said housing having a re cessed portion forming a housing for acentrifugal admum and retard mechanism of said distributor.

References Cited UNITED STATES PATENTS 1,416,490 5/1922 Monsen 184-6.28X1,422,995 7/1922 Link 123195A 1,807,650 6/ 1931 Chryst et al. 123195A2,226,596 12/1940 Swenson 123195A 2,482,332 9/1949 Eckert 123195A2,731,008 1/1956' Porsche et al. 123195A 2,780,212 2/1957 Malcolm123195A 3,023,847 3/1962 Kolbe 18'4'6.28 3,087,582 4/ 1963 Potter i 1846.28X 3,338,229 8/1967 De Lorean et a1. 123195A AL LAWRENCE SMITH,Primary Examiner US. Cl. X.R. 184-628

